55161517 has 4 divisors (see below), whose sum is σ = 55381536. Its totient is φ = 54941500.

The previous prime is 55161473. The next prime is 55161553. The reversal of 55161517 is 71516155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55161517 - 2¹⁹ = 54637229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55111517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109633 + ... + 110134.

It is an arithmetic number, because the mean of its divisors is an integer number (13845384).

Almost surely, 2^55161517 is an apocalyptic number.

It is an amenable number.

55161517 is a deficient number, since it is larger than the sum of its proper divisors (220019).

55161517 is a wasteful number, since it uses less digits than its factorization.

55161517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220018.

The product of its digits is 5250, while the sum is 31.

The square root of 55161517 is about 7427.0799780264. The cubic root of 55161517 is about 380.6671498193.

The spelling of 55161517 in words is "fifty-five million, one hundred sixty-one thousand, five hundred seventeen".